Size effect on the hysteresis characteristics of a system of interacting core/shell nanoparticles

Models of Maghematization: Observational Evidence in Support of a Magnetic Unstable Zone

“…Afremov et al. (2018) also found that magnetostatic interactions in powdered Fe/Fe 3 O 4 core‐shell particles decrease the coercivity and magnetization remanence. Thus, we expect the predicted averaged hysteresis parameters from numerical models to be substantially higher than those of experimental observations on powders.…”

“…(b)-(c) Share the same coding, with magnetization of elements aligning parallel to (111) being red and perpendicular being blue. by percentages P h and P m of ∼17% and ∼18%, respectively (Afremov et al, 2018;Fidler & Schrefl, 1996;Muxworthy et al, 2003). We might expect the dipole-dipole interaction to be proportional to the particles' decreasing saturation magnetization as the oxidation process occurs (Afremov et al, 2018;.…”

“…by percentages P h and P m of ∼17% and ∼18%, respectively (Afremov et al, 2018;Fidler & Schrefl, 1996;Muxworthy et al, 2003). We might expect the dipole-dipole interaction to be proportional to the particles' decreasing saturation magnetization as the oxidation process occurs (Afremov et al, 2018;. Therefore, in order to simulate hysteresis behavior for a powdered sample we might reasonably apply a simple interaction field correction…”

“…For such particles, Muxworthy et al. (2003) predicted that for near uniaxial magnetite grains of between 30 and 150 nm in size (side length of equivalent cubic volume), magnetostatic interactions in powders are likely to decrease B c and M rs / M s by percentages P h and P m of ∼17% and ∼18%, respectively (Afremov et al., 2018; Fidler & Schrefl, 1996; Muxworthy et al., 2003). We might expect the dipole‐dipole interaction to be proportional to the particles’ decreasing saturation magnetization as the oxidation process occurs (Afremov et al., 2018; Anisimov & Afremov, 2018).…”

“…(2003) predicted that for near uniaxial magnetite grains of between 30 and 150 nm in size (side length of equivalent cubic volume), magnetostatic interactions in powders are likely to decrease B c and M rs / M s by percentages P h and P m of ∼17% and ∼18%, respectively (Afremov et al., 2018; Fidler & Schrefl, 1996; Muxworthy et al., 2003). We might expect the dipole‐dipole interaction to be proportional to the particles’ decreasing saturation magnetization as the oxidation process occurs (Afremov et al., 2018; Anisimov & Afremov, 2018). Therefore, in order to simulate hysteresis behavior for a powdered sample we might reasonably apply a simple interaction field correction and similarly where B ini and M rs , ini are the initial coercivity and saturation remanence of oxidized magnetite calculated by the average over a lognormal distribution of grain sizes, where B cor and M rs , cor are the counterparts after the interaction field correction, and B mag and M rs , mag are the corresponding equivalents of stoichiometric magnetite.…”